<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>绘制一个卡券</title>
    <style>
        .base-coupons {
            width: 250px;
            height: 100px;
            position: relative;
            background: radial-gradient(circle at right top, transparent 10px, #eeeeee 0) top left / 60px 51% no-repeat,
                radial-gradient(circle at right bottom, transparent 10px, #eeeeee 0) bottom left /60px 51% no-repeat,
                radial-gradient(circle at left top, transparent 10px, #eeeeee 0) top right /190px 51% no-repeat,
                radial-gradient(circle at left bottom, transparent 10px, #eeeeee 0) bottom right /190px 51% no-repeat;
            /* filter: drop-shadow(3px 3px 3px rgba(0, 0, 0, .3)); */
        }

        .base-coupons::before {
            content: '';
            height: 80px;
            border-right: 1px dashed #03A9F4;
            position: absolute;
            left: 60px;
            top: 0;
            bottom: 0;
            margin: auto;
        }
    </style>
</head>

<body>

    <div class="base-coupons">

    </div>


</body>

</html>